A certain bridge is 4,224 feet long. What constant rate, in miles per hour, must be maintained in order to walk across the bridge in 12 minutes? (1 mile = 5,280 feet)
Physics · High School · Mon Jan 18 2021
Answered on
Given the statement:
A certain bridge is 4,224 feet long.
Determine the constant rate in miles per hour must be maintained in order to walk across the bridge in 12 minutes.
Solution:
Convert first feet to miles and minutes to hour using the general conversion method.
Feet to miles
= (4,224 ft)(1 mi/5,280 ft)
= 0.8 miles
minutes to hours
= (12 min)(1 hr/60 min)
= 0.2 min
Divide 0.8 miles by 0.2 min in order to determine the constant rate needed.
= 0.8mi/0.2 min
=4 mi/min
Final answer:
=4 mi/min